A little jumping to conclusions does wonders for the spirit, eh? HDFC's are not subsidized. Do a little homework before calling someone abusive. As she explained it, the sister is receiving medical treatment, hardly someone who is abusing the system. This is a tenant help forum, not a board for those looking to berate tenants seeking helpful clarification and advice. It may be that they are in a pickle, but your tone does little to help.

: Coops often have rules about occupancy by non-shareholders. And if there is a subsidy involved, there is almost certainly an occupancy requirement for your sister. Since these subsidy programs are paid for with OUR tax dollars and since there is often a waiting list to get such an apartment, I have no patience for people who abuse the system as your sister has. Trying to fight the coop's rules will almost certainly be a losing battle. The best thing you can do is look aggressively for an apartment now, and also put an application in for such a coop yourself if thats what you want. Or perhaps your sister is willing to sell her share to you?

: If you choose to follow the advice of the idiots who suggest you fight this, then I hope you have a lot of time on your hands, and a lot of money. Because it will cost you both, and chances are you will still have to leave. If you seriously want to stay, look into lawful ways of acquiring ownership from your sister or apply for your own coop.